\begin{table}[tbp] \centering
\newcolumntype{R}{>{\raggedleft\arraybackslash}X}
\newcolumntype{L}{>{\raggedright\arraybackslash}X}
\newcolumntype{C}{>{\centering\arraybackslash}X}

\begin{tabularx}{\linewidth}{lccc}

\toprule
Election type&Year t&Year t+1&Nb of races \tabularnewline
&(running variable)&(electoral outcomes)& \tabularnewline
&(1)&(2)&(3) \tabularnewline
\midrule &1979&1982&62 \tabularnewline
&1979&1985&937 \tabularnewline
&1982&1985&42 \tabularnewline
&1982&1988&1023 \tabularnewline
&1985&1988&59 \tabularnewline
&1985&1992&1460 \tabularnewline
&1988&1992&28 \tabularnewline
&1988&1994&1574 \tabularnewline
&1992&1994&28 \tabularnewline
&1992&1998&1926 \tabularnewline
&1994&1998&24 \tabularnewline
&1994&2001&1920 \tabularnewline
&1998&2001&30 \tabularnewline
&1998&2004&1951 \tabularnewline
&2001&2004&16 \tabularnewline
&2001&2008&1912 \tabularnewline
&2004&2008&16 \tabularnewline
&2004&2011&1979 \tabularnewline
&2008&2011&11 \tabularnewline
\midrule Total&&&14998 \tabularnewline
\bottomrule 

\end{tabularx}
\end{table}
